There was a thread a while back about this same problem. After testing the sender and the wiring, a member deterined the problem was with a bad solder connection on the back of the Vehicle Information Center (a display in the lower center console of a ZJ).
I was having this same problem. My sender tested good, but I decided to replace it anyway. After that I've had the warning message and chimes only once. It hasn't reoccurred in the past four months. I'll wait until it becomes a problem again before I remove the VIC and resolder the connections.
'96 ZJ, 4.0L, 42RE, NP242, stock D30 and D35-LS w/ 3.73, 4-1/2" lift, 32" BFG ATs, Magnaflow, JKS track bars and disconnects, spare tire carrier, Optima red top, ROLA roof rack, KC SlimLite driving lights, CB and Yaesu ham radios, GPS